1 /*
2  * OLPC XO-1 additional sound features
3  *
4  * Copyright © 2006  Jaya Kumar <jayakumar.lkml@gmail.com>
5  * Copyright © 2007-2008  Andres Salomon <dilinger@debian.org>
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2 of the License, or
10  * (at your option) any later version.
11  */
12 #include <sound/core.h>
13 #include <sound/info.h>
14 #include <sound/control.h>
15 #include <sound/ac97_codec.h>
16 #include <linux/gpio.h>
17 
18 #include <asm/olpc.h>
19 #include "cs5535audio.h"
20 
21 #define DRV_NAME "cs5535audio-olpc"
22 
23 /*
24  * OLPC has an additional feature on top of the regular AD1888 codec features.
25  * It has an Analog Input mode that is switched into (after disabling the
26  * High Pass Filter) via GPIO.  It is supported on B2 and later models.
27  */
28 void olpc_analog_input(struct snd_ac97 *ac97, int on)
29 {
30 	int err;
31 
32 	if (!machine_is_olpc())
33 		return;
34 
35 	/* update the High Pass Filter (via AC97_AD_TEST2) */
36 	err = snd_ac97_update_bits(ac97, AC97_AD_TEST2,
37 			1 << AC97_AD_HPFD_SHIFT, on << AC97_AD_HPFD_SHIFT);
38 	if (err < 0) {
39 		snd_printk(KERN_ERR "setting High Pass Filter - %d\n", err);
40 		return;
41 	}
42 
43 	/* set Analog Input through GPIO */
44 	gpio_set_value(OLPC_GPIO_MIC_AC, on);
45 }
46 
47 /*
48  * OLPC XO-1's V_REFOUT is a mic bias enable.
49  */
50 void olpc_mic_bias(struct snd_ac97 *ac97, int on)
51 {
52 	int err;
53 
54 	if (!machine_is_olpc())
55 		return;
56 
57 	on = on ? 0 : 1;
58 	err = snd_ac97_update_bits(ac97, AC97_AD_MISC,
59 			1 << AC97_AD_VREFD_SHIFT, on << AC97_AD_VREFD_SHIFT);
60 	if (err < 0)
61 		snd_printk(KERN_ERR "setting MIC Bias - %d\n", err);
62 }
63 
64 static int olpc_dc_info(struct snd_kcontrol *kctl,
65 		struct snd_ctl_elem_info *uinfo)
66 {
67 	uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
68 	uinfo->count = 1;
69 	uinfo->value.integer.min = 0;
70 	uinfo->value.integer.max = 1;
71 	return 0;
72 }
73 
74 static int olpc_dc_get(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)
75 {
76 	v->value.integer.value[0] = gpio_get_value(OLPC_GPIO_MIC_AC);
77 	return 0;
78 }
79 
80 static int olpc_dc_put(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)
81 {
82 	struct cs5535audio *cs5535au = snd_kcontrol_chip(kctl);
83 
84 	olpc_analog_input(cs5535au->ac97, v->value.integer.value[0]);
85 	return 1;
86 }
87 
88 static int olpc_mic_info(struct snd_kcontrol *kctl,
89 		struct snd_ctl_elem_info *uinfo)
90 {
91 	uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
92 	uinfo->count = 1;
93 	uinfo->value.integer.min = 0;
94 	uinfo->value.integer.max = 1;
95 	return 0;
96 }
97 
98 static int olpc_mic_get(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)
99 {
100 	struct cs5535audio *cs5535au = snd_kcontrol_chip(kctl);
101 	struct snd_ac97 *ac97 = cs5535au->ac97;
102 	int i;
103 
104 	i = (snd_ac97_read(ac97, AC97_AD_MISC) >> AC97_AD_VREFD_SHIFT) & 0x1;
105 	v->value.integer.value[0] = i ? 0 : 1;
106 	return 0;
107 }
108 
109 static int olpc_mic_put(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)
110 {
111 	struct cs5535audio *cs5535au = snd_kcontrol_chip(kctl);
112 
113 	olpc_mic_bias(cs5535au->ac97, v->value.integer.value[0]);
114 	return 1;
115 }
116 
117 static struct snd_kcontrol_new olpc_cs5535audio_ctls[] = {
118 {
119 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
120 	.name = "DC Mode Enable",
121 	.info = olpc_dc_info,
122 	.get = olpc_dc_get,
123 	.put = olpc_dc_put,
124 	.private_value = 0,
125 },
126 {
127 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
128 	.name = "MIC Bias Enable",
129 	.info = olpc_mic_info,
130 	.get = olpc_mic_get,
131 	.put = olpc_mic_put,
132 	.private_value = 0,
133 },
134 };
135 
136 void olpc_prequirks(struct snd_card *card,
137 		    struct snd_ac97_template *ac97)
138 {
139 	if (!machine_is_olpc())
140 		return;
141 
142 	/* invert EAPD if on an OLPC B3 or higher */
143 	if (olpc_board_at_least(olpc_board_pre(0xb3)))
144 		ac97->scaps |= AC97_SCAP_INV_EAPD;
145 }
146 
147 int olpc_quirks(struct snd_card *card, struct snd_ac97 *ac97)
148 {
149 	struct snd_ctl_elem_id elem;
150 	int i, err;
151 
152 	if (!machine_is_olpc())
153 		return 0;
154 
155 	if (gpio_request(OLPC_GPIO_MIC_AC, DRV_NAME)) {
156 		printk(KERN_ERR DRV_NAME ": unable to allocate MIC GPIO\n");
157 		return -EIO;
158 	}
159 	gpio_direction_output(OLPC_GPIO_MIC_AC, 0);
160 
161 	/* drop the original AD1888 HPF control */
162 	memset(&elem, 0, sizeof(elem));
163 	elem.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
164 	strncpy(elem.name, "High Pass Filter Enable", sizeof(elem.name));
165 	snd_ctl_remove_id(card, &elem);
166 
167 	/* drop the original V_REFOUT control */
168 	memset(&elem, 0, sizeof(elem));
169 	elem.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
170 	strncpy(elem.name, "V_REFOUT Enable", sizeof(elem.name));
171 	snd_ctl_remove_id(card, &elem);
172 
173 	/* add the OLPC-specific controls */
174 	for (i = 0; i < ARRAY_SIZE(olpc_cs5535audio_ctls); i++) {
175 		err = snd_ctl_add(card, snd_ctl_new1(&olpc_cs5535audio_ctls[i],
176 				ac97->private_data));
177 		if (err < 0) {
178 			gpio_free(OLPC_GPIO_MIC_AC);
179 			return err;
180 		}
181 	}
182 
183 	/* turn off the mic by default */
184 	olpc_mic_bias(ac97, 0);
185 	return 0;
186 }
187 
188 void olpc_quirks_cleanup(void)
189 {
190 	gpio_free(OLPC_GPIO_MIC_AC);
191 }
192